On Weyl-reducible conformal manifolds and lcK structures

Abstract

A recent result of M. Kourganoff states that if $D$ is a closed, reducible, non-flat, Weyl connection on a compact conformal manifold $M$, then the universal covering of $M$, endowed with the metric whose Levi-Civita covariant derivative is the pull-back of $D$, is isometric to ${\mathbb{R}}^q\times N$ for some irreducible, incomplete Riemannian manifold $N$. Moreover, he characterized the case where the dimension of $N$ is $2$ by showing that $M$ is then a mapping torus of some Anosov diffeomorphism of $T^{q+1}$. We show that in this case one necessarily has $q=1$ or $q=2$.

7 pages, slightly expanded version, modified title

References in corpus (2)

• Lattices in almost abelian Lie groups with locally conformal Kähler or symplectic structures
• A counterexample to Belgun-Moroianu conjecture